An Australian designed electric car is among two concept cars unveiled by General Motors at the Detroit Auto Show, in a move the chief designer says shows the company "is really a believer" in Australian design.

Sensors on American football helmets could be a weapon in the fight against teen deaths from on-field concussions, but some schools are still resisting their uptake, North America correspondent Ben Knight writes.

Hackers who penetrated the computers of Sony Pictures have issued a new threat of 9/11 style attacks if the company goes ahead with the release of a movie that makes fun of the North Korean leader, Kim Jong-un.